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    <h2>机房打扫分为几步</h2>
    <ol>
        <li>安排人员</li>
        <li>分配工具</li>
        <li>开始打扫</li>
    </ol>
    <h2>想去的城市</h2>
    <ul>
        <li>成都</li>
        <li>北京</li>
        <li>上海</li>
    </ul>
    <dl>
        <dt>做好笔记</dt>
        <dd>把学到的知识记下来</dd>
        <dt>多加练习</dt>
        <dd>练习多了就慢慢会了</dd>
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